Whisk the vinegars, honey, olive oil salt, pepper, garlic powder and thyme. Set aside.
1 tablespoon red wine vinegar, 1 tablespoon balsamic vinegar, 1 tablespoon apple chider vinegar, 1 tablespoon honey, Generous pinch of Kosher salt and ground black pepper, ½ teaspoon garlic powder, ½ teaspoon dried thyme, 1 teaspoon olive oil
Pile 2 cups of raw spinach on a plate. Set aside.
2 cups Spinach Leaves
Heat a nonstick skillet over medium-high heat and spray with non-stick cooking spray.
Separate the onion into rings, dip into the vinegar mixture and brown in the skillet.
1-2 slices of Vidalia onion
While the onion is browning, slice the mushroom cap into strips about ½ inch thick and place in the vinegar mixture.
1 Large Portobello Mushroom Cap
Once the onion is soft and browning on the edges remove from the heat and top the pile of spinach with them.
Place the marinated mushroom strips in the skillet. Dip the pepper strips into the vinegar mixture and add them to the skillet as well.
½ red bell pepper cut into strips
Cook the mushrooms about 2-3 minutes a side. Remove them and add them to the top of the spinach.
With the pepper strips still in the skillet add the rest of the vinegar mixture. It should immediately boil up and thicken into a reduction.
Remove from the heat. Top the spinach with the peppers and drizzle the thickened vinegar mixture over the salad. Sprinkle with a little parmesan cheese.
½ tablespoon parmesan cheese